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Search: id:A012202
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A012202 sech(arctan(arcsin(x)))=1-1/2!*x^2+9/4!*x^4-249/6!*x^6+11953/8!*x^8... +0
1
1, -1, 9, -249, 11953, -992401, 115133433, -19289685193, 4104153335777, -1154213252748193, 390283459641717353, -165544701587974757145, 81456402896849322863505, -48584594120969426596224305 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Adjacent sequences: A012199 A012200 A012201 this_sequence A012203 A012204 A012205

Sequence in context: A075127 A013733 A112028 this_sequence A012098 A012072 A007408

KEYWORD

sign

AUTHOR

Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

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